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S. M. ATGHISON. ORE GONGENTRATOR.

No. 268,351. Patented Nov. 28, 1882.

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(No Model.) 2 Shets-Sheet 2.

S. M. .ATOHISON.

ORE CONGENTRATOR.

No. 268,351. Patented Nov. 28, 1882.

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N. PEI'ERS. PIvoIb-Ulhngraphen Wallungloln p. c,

UNITED STATES PATENT OFFICE.

SILAS M. ATGHISON, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE- HALFTO WILLARD F. ARNOLD, OF SAME PLACE.

ORE-CON'CE NTRATOR.

SPECIFICATION forming part of Letters Patent No. 268,351, dated November28, 1882. "Application filed May 25, 1881. (No model.)

T all whom it may concern.-

Be it known that I, SILAS M. ATOHISON, of the city and county of SanFrancisco, in the State of California, have invented certainImprovements in Concentrators; and I dohereby declare that the followingis a full, clear, and exact description thereof, reference being bad tothe accompanying drawings.

My invention relates to an improved concen- Io trator for separating,the heavy and valuable particles of ore pulp from the light andworthless portion.

It consists of an endless belt of india-rubber, canvas, or othermaterial, mounted on a rock- 1 ing frame and inclined transversely toits travel, so that the pulp which is fed upon its upper edge will flowdown the incline in a direction at right an gles to the travel of thebelt.

- The belt is provided with riffle-bars which arrest the heavyparticles, while the lighter portign passes down the incline and overits lower e ge.

Referring to the accompanying drawings, Figure l is a side elevation.Fig. 2 is a cross- 2 5 section. Fig. 3 is a plan view.

In a suitable frame, A is mounted a table or platform, A. This platformis supported on short shafts or truunions B B, the trunnion B having itsbearing in the frame A while the trunnion B has its bearing in themovable frame A, which rests on rollers r r. This mounting of thetablepermits of a rocking motion being imparted to it, and also of areciprocating movement of one side. This table is inclined toward oneside, and it has a roller, 0, at each end and several small intermediaterollers, D D. Around this frame I willpass an endless belt, E, and carryit down under an adjustable or tightening roller, F, which is 0supported below the middle of the frame by a hanger or arm, G, so thatthe belt can be tightened by adjusting the roller by means of a screw,as shown. The upper side of the belt will then beflat and inclined fromone side of 5 the frame to the other. Across the surface of this belt Iarrange shallow riffles in either or bothdirections. To this table Iwill impart a rocking or tossing motion by a partial rotation of theframe on its trunnions in alternate directions. At the same time Iimpart to the belt a traveling motion in one direction. This is done bythe following means: 1 apply ragpulleys h on the ends of the two endrollers,

from each of which a belt or chain, I, passes around a large wheel, J,on the trunnion of i the frame. On the side of this large wheel is aratchet-wheel, K, with whicha pawl,l,which is pivoted to a reciprocatinghearing, A, engages, so that when the frame oscillates in one directionthe pawl will partially rotate the on large wheel, and thus cause theendless belt to travel in the opposite direction intermittently. Thereciprocating or rocking motion is imparted to the frame by means ofconnectingrods P P, the upper united ends of which are 6 applied on thewrist-pin of a crank,p, fixed on one end of a horizontal shaft, S. Thisshaft S has keyed on it a belt-pulley, T, and also a bevel spur-wheel,t, which latter engages with a corresponding wheel, t, on a verticalshaft, T. The bevel-wheels u u at the foot of shaft T give rotation to ashort shaft bearing on one end a crank, 22, which acts through themedium of a pitman-rod, w, to impart a rectilinear reciprocating motionto the hearing A, which is 7 mounted on rollers r 1'. (Shownin Fig. 1.)It will be seen that the apron-carrying frame A not only leceives avertical vibrating motion, but it also receives at one sidea horizontalvibrating motion, thereby effecting a most complete agitation of thepulpy material fed upon the apron and a separation of the metallic atomsfrom it. The pulp will be fed upon the upper corner of the belt at thepoint where it passes up over the end roller, 1), from a box, M, and itwill then flow down the incline surface of the belt, being stirred andagitated by the rocking motion, so that the sulphurets and heavyparticles will settle to the bottom and be caught by the riffles, whilethe lighter portion passes down and over a spout at the lower edge ofthetable or belt. At the same time the traveling motion of the belt willcarrytheretained heavy particles around underneath the table and 5 downunder the lower roller, whereit will pass through a tank of water, whichwill wash off and remove the heavy particles.

I am aware that an endless belt with trans verse riffles and a ratchetand pawl for operating the same is not new.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s

1. The combination of a supporting-fratme, a frame pivoted thereto, anendless apron having riffles arranged transversely across its surface, aratchet and pawl for imparting" an intermittenttraveling movement tosaid apron, and a feed-box mounted on the pivoted frame, substantiallyas described;

2. The combination of a sup 'iorting-t'rame, a frame pivoted thereto,means for rocking the pivoted frame, and an endless traveling apronwhich is inclined transversely to the direction of its travel,substantially as described.

3. The combination of a supporting-frame, a

frame pivoted thereto, an endless apron having riftles arranged acrossits surface, a ratchet and pawl for imparting an intermittent travelingmovement to said apron, a movable carriage or support on which one endof the shaft B has its bearings, and mechanism for imparting areciprocatory motion to said carriage, substantially as described.

4. The combination of the supporting-frame,

. the apron-carrying frame pivoted thereto, the

driving-shaft, the crank thereon, the rods connecting the apron-carryingframe with said crank, an intermediate crank and crank-shaft, a rodconnecting one trunnion ofthe aproncarrying frame with said intermediatecrank, and mechanism connecting said intermediate crank with thedriving-shaft, substantially as described.

In witness whereof I have hereunto set my hand.

SILAS M. ATGHISON.

Attest:

WM. F. CLARK, EDWARD E. Osnonn.

